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95results about How to "High chemical stability" patented technology

Antibacterial-type nanofiber-based preservative film and preparation method thereof

The invention discloses an antibacterial-type nanofiber-based preservative film and a preparation method thereof. The novel antibacterial-type nanofiber-based preservative film which has the excellent mechanical property, can be completely degraded and completely meets the physical performance requirements of preservative films is prepared by taking micro-fibrillated nanocellulose (MFC) and chitosan as raw materials; the preservative film is prepared mainly through the step that ultrasonic blending is performed on the micro-fibrillated nanocellulose (MFC) and an aqueous acetic acid solution of chitosan under the appropriate proportion condition. Compared with a food preservation material on the market, the antibacterial-type nanofiber-based preservative film has the advantages that the production technology is simple, and the preparation cost is low; the preservative film also has the advantages of being efficient, antibacterial, high in air permeability, transparency, bonding property, skin film flexibility and wear resistance and the like, is a new-generation green and environment-friendly type preservative film for replacing an existing plastic preservative film, can serve as a material for packaging food and has the wide application prospect in the field of food packaging films.
Owner:TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY

High temperature oxidation resistant film sensor and production method thereof

The invention belongs to a high temperature oxidation resistant film sensor and a production method thereof. The film sensor comprises a to-be-tested alloy substrate and a NiCrAlY alloy transition layer adhered on the top surface of the substrate, an aluminum oxide/aluminum nitride transition layer, an aluminum oxide/aluminum nitride ceramic insulating layer, a sensor function layer composed of electrodes, a Si3N4 isolating layer and an aluminum oxide protective layer arranged on the insulating layer are orderly arranged above the transition layer; the production method comprises surface treatment of alloy substrate, NiCrAlY alloy transition layer settling on the alloy substrate, precipitation, oxidation or nitriding treatment of metal aluminum, setting of Al2O3/AlN ceramic insulating layer, setting of film sensor function layer and Si3N4 isolating layer thereof, and setting of Al2O3 protective layer. The Si3N4 isolating layer in the invention can be used for effectively resisting the oxygen atom dissolved from the insulating layer and aluminum oxide protective layer at high temperature environment to diffuse to the function layer, the stability and reliability of the sensor at high temperature high pressure working environment can be improved, and relative and more accurate basic data is provided for the study and design of a turbine engine.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA

Method used for controllable preparation of monodisperse mesoporous molybdenum disulfide nanospheres

InactiveCN105347401ALow costHigh chemical stabilityMaterial nanotechnologyMolybdenum sulfidesSolventMaterial synthesis
The invention relates to a method used for controllable preparation of monodisperse mesoporous molybdenum disulfide nanospheres, and belongs to the technical field of molybdenum disulfide nano material synthesis. The method comprises following steps: a surfactant, an organic solvent, and a Mo salt aqueous solution are mixed so as to obtain a mixed solution; the mixed solution is delivered into a glass bottle for stirring and heating reflux, wherein temperature is controlled to be 80 to 130 DEG C; SiO2 sol is added into the mixed solution dropwise; an obtained mixture is delivered into a stainless steel reaction vessel, the stainless steel reaction vessel is delivered into a drying oven for reaction, wherein reaction temperature is controlled to be 180 to 260 DEG C; an obtained solid product is collected from the stainless steel reaction vessel, and is washed with a fluorine-containing solution for a plurality of times so as to obtain target products. According to the method, self assembling of the mesoporous MoS2 nanospheres is realized using SiO2 templating agent and water vaporization of liquid microemulsion; microemulsion method is adopted, so that a problem that the size of nanospheres is uncontrollable is solved. The particle size distribution of the MoS2 nanospheres can be controlled effectively via controlling the amounts of the surfactant, water, the oil solvent, and the Mo salt.
Owner:CHANGZHOU UNIV

Water-based nano thin-coating heat preservation paint and preparation method thereof

The invention discloses a water-based nano thin-coating heat preservation paint and a preparation method thereof. The paint comprises the following raw materials by weight: 30-40 parts of an acrylic emulsion, 5-10 parts of titanium dioxide, 20-40 parts of hollow glass beads, 5-20 parts of aerogel and 5-10 parts of a film-forming assistant. According to the invention, the hollow glass beads and aerogel are used as the heat insulation basic raw materials, the heat conductivity coefficient of the paint is greatly reduced and is as low as 0.031-0.035W/m.K, and the paint can reach a remarkable heatinsulation effect under the condition of a very small construction thickness. Meanwhile, the hollow glass beads and the aerogel are conducive to improving the chemical stability of the paint itself,thus improving the covering power, lightening power, corrosion resistance, light resistance and weather resistance, and enhancing the mechanical strength of the paint; cellulose, a wetting dispersant,a defoaming agent and a preservative are mixed; by virtue of ethylene glycol, the acrylic emulsion and a pH regulator, the paint has excellent cohesiveness, weather resistance, film-forming properties, gloss and color retention and mechanical properties; and the use of a vinyl chloride-vinylidene chloride copolymer emulsion also can reach a grade A1 flame retardant effect.
Owner:重庆兴渝新材料研究院有限公司

Formula of acid and alkali-resistant and anti-pollution ultrafiltration membrane and preparation method thereof

The invention discloses a formula for an acid and alkali-resistant and anti-pollution ultrafiltration membrane and a preparation method thereof. The ultrafiltration membrane is formed by coating a membrane casting liquid consisting of polyvinylidene fluoride, a nano-cellulose crystal and a pore forming agent in a certain mass ratio on a high-strength non-woven fabric substrate and adopting a non-solvent induced phase separation (NIPS) method in a phase conversion method. Due to the presence of a high-strength non-woven fabric support layer, the mechanical strength of the membrane is enhanced. The nano-cellulose crystal contains a hydrophilic group, and an ultrafiltration membrane formed by coblending the nano-cellulose crystal with the polyvinylidene fluoride can be used for overcoming the defects of poor anti-pollution capability and poor hydrophilicity of a pure polyvinylidene fluoride ultrafiltration membrane. The ultrafiltration membrane is resistant to corrosion of acids and alkalis, has high chemical stability, high water flux, high trapping characteristic, high mechanical strength and anti-pollution performance. According to the formula, the acid and alkali corrosion resistance of the membrane is enhanced, and the service life of the ultrafiltration membrane is prolonged.
Owner:TSINGHUA UNIV

Lithium manganese nickel oxide cathode material having nickel manganese concentration gradient and preparation method thereof

ActiveCN105226270AHigh chemical stabilityEliminate Volume Change MismatchesCell electrodesSecondary cellsChemical compositionRoasting
The invention discloses a lithium manganese nickel oxide cathode material having nickel manganese concentration gradient and a preparation method thereof. The average chemical composition of the lithium manganese nickel oxide cathode material can be shown as a molecular formula of LiNi<0.5-x>Mn<1.5+x>O<4>, wherein x is more than or equal to 0.1 and less than or equal to 0.35, the concentration of Ni is gradually reduced in a gradient distribution manner from the particle center to the particle surface of the lithium manganese nickel oxide cathode material, and the concentration of Mn is gradually reduced in a gradient distribution manner from the particle center to the particle surface of the lithium manganese nickel oxide cathode material. The preparation method comprises the following steps of firstly, synthesizing a spherical-like particle having a core-shell structure by a co-precipitation process; and finally, preparing the lithium manganese nickel oxide cathode material with change on the nickel and manganese concentration by element diffusion during the high-temperature roasting process. The cathode material disclosed by the invention has excellent high-temperature cycle stability and rate performance, high reversible capacity, high chemical stability, long cycle life, and excellent comprehensive electrochemical performance.
Owner:UNIV OF SCI & TECH BEIJING

Preparation method of filled-type thermally conductive silicone rubber composite material

The invention discloses a preparation method of a filled-type thermally conductive silicone rubber composite material. The processing steps of the method are as follows: 1) using alcohol solution to mix carbon-encapsulated copper nanoparticles evenly, and then drying the nanoparticles to prepare dry powder; 2) adding the raw silicone rubber onto a roller, after the raw rubber covers the roller, adding carbon-encapsulated copper nanoparticles dry powder and hydroxy silicone oil in sequence in accordance with the formulation design amounts; mixing the dry powder and the hydroxy silicone oil on the roller repeatedly until being uniform, then adding a vulcanizing agent, and then mixing the mixture uniformly, thin-passing a lower sheet to obtain the silicon rubber compound; 3) putting mixed silicone rubber into a mold, carrying out first vulcanization after cold pressing and mold filling; 4) putting a vulcanization-molded sample on a glass cloth and carrying out post vulcanization on the sample in an air dry oven to obtain finished products. The invention mixes the carbon-encapsulated copper nanoparticles and high-temperature silicone rubber to ensure that the carbon-encapsulated copper nanoparticles are evenly scattered in the silicone rubber substrate to form an integral thermally conductive network chain, thereby improving the thermal conductivity of the silicone rubber.
Owner:GUANGDONG SUNLITE MATERIAL SCI & TECH

Method for preparing multielement chelate fertilizer by use of threonine mother liquor

The invention belongs to the technical field of the biochemical industry, discloses a method for preparing a multielement chelate fertilizer by use of a threonine mother liquor and aims at solving the problems of low utilization rate of the threonine mother liquor, environmental pollution and high preparation cost of the chelate fertilizer in the prior art. The method for preparing the multielement chelate fertilizer by use of the threonine mother liquor comprises the steps of adding water-soluble inorganic salts containing elements needed by crops to the threonine mother liquor and adding water for dissolving, keeping the pH value of the solution in the range of 6-8, carrying out a stirring reaction for 1-5 hours at 70-85 DEG C, and then cooling and crystalizing the reaction mixture, and then drying, grinding, weighing and packaging the crystals. The chelate fertilizer obtained by the method is characterized in that the antagonistic action between various elements such as zinc, magnesium, iron, calcium and boron disappears and the synergistic effect between the elements is improved after the threonine is chelated with all the elements, and therefore, the chemical stability of each element is enhanced so that fertilizer loss or invalidation is reduced, and furthermore, the utilization rate of the fertilizer is increased. The method is simple and low in investment.
Owner:李学春

Preparation method of intelligent glass cathode electrochromic layer coating material

The invention discloses a preparation method of an intelligent glass cathode electrochromic layer coating material. In a process of preparing the intelligent glass cathode electrochromic layer tungsten oxide coating material, various oxides are fully and uniformly mixed by using slip casting, so that the density and uniformity of a target material are improved, and then the service life of the target material is prolonged. The chemical stability of the tungsten oxide material is improved by adding a second oxide into the tungsten oxide. Oxygen vacancies are formed by the vacuum treatment in asintering process, so that the material has conductivity, and stable sputtering is facilitated. In addition, a process of staged heating sintering is adopted, and other gases are added in argon gas, so that the film-forming rate can be improved, the surface roughness can be reduced, the sputtering rate can be improved, the film roughness can be reduced, the activation of equipment can be improved,the production cost can be reduced, the application of the tungsten oxide film in electrochromic devices is greatly improved, the production requirements are met, and the market promotion and productpopularization are facilitated.
Owner:SHENZHEN KING CHUANG TECH & ELECTRONICS
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